Porous size dependent g-C3N4 for efficient photocatalysts: Regulation synthesizes and physical mechanism

被引：52

作者：

Kong, Lingru ^{[1
,2
]}

Wang, Jingang ^{[3
]}

Mu, Xijiao ^{[2
]}

Li, Rui ^{[4
]}

Li, Xiaoxue ^{[1
,2
]}

Fan, Xiaoxing ^{[1
]}

Song, Peng ^{[1
]}

Ma, Fengcai ^{[1
]}

Sun, Mengtao ^{[2
]}

机构：

[1] Liaoning Univ, Dept Phys, Shenyang 110036, Liaoning, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Math & Phys, Ctr Green Innovat, Beijing Key Lab Magnetophotoelect Composite & Int, Beijing 100083, Peoples R China

[3] Liaoning Shihua Univ, Coll Sci, Computat Ctr Property & Modificat Nanomat, Fushun 113001, Peoples R China

[4] Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China

来源：

MATERIALS TODAY ENERGY | 2019年 / 13卷

基金：

中国国家自然科学基金;

关键词：

g-C3N4; Porous size; Efficient photocatalysts; Regulation synthesizes; Physical mechanism; GRAPHITIC CARBON NITRIDE; GENERALIZED GRADIENT APPROXIMATION; HYDROGEN EVOLUTION; SYNTHETIC STRATEGY; NANOSHEETS; COMPOSITE; EXCHANGE; SOLIDS; ENERGY;

D O I：

10.1016/j.mtener.2019.04.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We propose a new template-free approach for the synthesis of porous graphitic carbon nitride (g-C3N4) nanosheets as efficient photocatalysts. This new template-free method includes a one-step hydrothermal treatment and a sequential two-step thermal treatment. This method can provide massively porous g-C3N4 nanosheets without external physical defects (such as atom doping and/or atom vacancies) in the g-C3N4 nanosheets. The Brunauer-Emmett-Teller (BET) surface areas and pore volumes of the porous g-C3N4 nanosheets can reach 125 m(2) g(-1) and 1.2 cm(3) g(-1), respectively, thereby showing significant increases of 22 and 15 times, respectively, compared with those of the pristine g-C3N4 nanosheets. The synthesized porous g-C3N4 nanosheets have large specific surface areas and exhibit high photocatalytic activities that are enhanced by as much as 8 times compared to those of the pristine g-C3N4 for the photodegradation of gas pollutants (using the photocatalysis of 2-propanol to acetone as an example) under visible light (lambda > 420 nm). Experimental and theoretical results reveal the suitable porous size of porous g-C3N4 plays essential role for the efficient photocatalysis. Our multistep template-free approach can provide a new method for the preparation of porous g-C3N4 nanosheets as efficient photocatalysts that are better than those obtained by destroying the physical structures of the pristine g-C3N4 nanosheets. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：11 / 21

页数：11

共 47 条

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